Oil-burner nozzle



Oct. 29, 1929- A. P. HOLDEN OIL BURNER NOZZLE Filed Sept. 21, 1927 Int/enten :7i-.Mur PHO/Jen l Patented Oct. 29, 1929 UNITED STATES PATENT OFFICE ARTHUR I. HOLDEN, OF TORONTO, ON TARIO, CANADA OIL-BURNER NozzLE i Application led September 21, 1927. Serial No. 221,085.

The principal objects of the invention are, to greatly simplify the construction of oil burner nozzles, and to eliminate the dripping 15 a well below the level of the discharge and such oil is forced through a conduit by the combined pressure of the air on the surface of the oil within the trap andthe inspirator suction effected by the flow of air around the 20 discharge end.

A further and important feature consists in the novel arrangement of air passages through the burner element between its outer walls and the oil carrying portion.

. tional view of my improved burner with the Y side plate removed therefrom.

Figure `2 is a 'longitudinal mid-sectional view.

f 30' Figure 3 is across sectional view through the line 3 3 of Figure 1. .Y

Figure 4 is a plan view of the burner` on a reduced scale showing it attached to the blower element.

The present form of burner nozzle is convstructed of a metal casting 1 which is formed with a-central core passage 2 therethrough V and laterally extending flanges 3 and lwhich form theside channels 5 and 6.

A fastening flange 7 is arranged at one end of the member 1 and is preferably 'set at an I anglethereto so that lthe main burner casting will rest in a slightly downwardly sloping position when the flange 7 is in a vertical position.

The forward end of the casting 1 is formed" with a cylindrical boss 8 on the underside, the axis of which slopes at an acute backward angle from the axis of the main casting 1.

.50, The boss 8 is internally threaded and has In the drawings, Figure 1 is a side elevathe outerwall of the chamber 12 the oil tube 17.y The arrangement of the air chamber formed secured therein a cup-shaped cap 9 which is provided with a shoulder 10 `to abut the outer end of the boss and form a fluid tight Joint.

A battle wall 11 is arranged atthe outward end of the central passage 2 and extends across the circular opening in the boss 8.

A recess 12 is formed at the outward side of the baifle 11 and communicates at its lower end with the opening through the boss 8 and the interior of the cap 9. f

A boss 13 projects from the forward side of the recess 12 at its upper end and is surrounded on its upward and outward sides by a passage 14 and said recess is bored from its.V inward side with a ho1e 15 which meets a hole 16 bored from the' outward side.

A tube 17 is threaded into the hole 15 and extends downwardly into the interior of the cap 9 and a tube 18 is threaded into the hole;

16 and extends outwardly from the boss 13 axially through a threaded opening 19.

The outer end 20 of the tube 18 is reduced to a desirable diameter for feeding oil anda nozzle 21 is threaded into the opening 19, said nozzle having a tapering outlet surrounding the reduced end 2O of the pipe 18.

v- The outer sides of the passages 5 and are v covered by plates22 and 23, thek plate 23 having one or more openings 24 therein arranged@ close to theflanged end 7.v f

`An opening 25 extends through the flange 7 from the passage 5 and communicates with the intake of a suitable form of air pump 26, which is here shown of circular form. l i The passage 6 communicates with the passage 5 at the outward end of the casting through an opening 27 which extends around surrounding by the passages 6, 27 and5 insulates the centralxpassage 2 from direct contact'with the heat of the combustion chamber into which the burner projects and the heat is absorbed by the flow of air which is drawn through the opening 24 into the passage 6 through the passage 27 to 5 and through the opening 25 Vto the pump. The pump discharges into the `opening 2.

The oil to be distributed is introduced into the passage 2, preferably through the pump and is blown through said passage and strikes the baffle 11. The air flows under the baille into the chamber 12 and passes through the passage 14 to the nozzle 21. The oil striking the baffle 11 is precipitated into the chamber formed by the hollow capk 9 and submerges the bottom end of the oil tube 17. The pressure of the air within the cap 9 acting against the surface of the oil' trapped in said cap, forces the oil up through thetube 17 and passages 15 and 16 to the nozzle tube 18 and the flow of air around the nozzle tube out through the nozzle 21 accelerates the movement of the oil and the air being directed through the tapering discharge nozzle atomi`zes the oil into a fine spray asv it'leaves the nozzle end 20 of the feed tube.

The operation of this ynozzle is extremely simple and it produces a very desirable# and efficient result in the atom'ization of the oil. The peculiar arrangement of the oil well in the cap 9 obviates the dripping of oil from the nozzle when the burner is' notV in use, as the column of oil within the tube 17 is longer than and extends belowr the Vdischarge end of the tube 18 so that immediately upon the cessation of the How of lair thror'igh the nozzle and the consequenty relief of pressure within the cap 9 against the oil surface therein, the oil within the' tube 17 flows back into the cap chamber siphoning the oil in the tube 18 back with it.`

It will also be seen that the burner is very readily accessibleV for cleaning. The cap 9 may be very easily removed, as also may' the nozzle 21 when the oil feedtubes may be easily and quickly removed if desired.

It-will also be readily understood that-with thisv type of burner, While the oil may bey fed to the air pump'and'it isz-preferable t'do so in orde-1' that: the oil may form a lubrication for vthe pump, any atornizing taking place in the pumpis' not effective in carrying the atomized oil through to the burner, as the oil is precipitated by Contact with the barile 11 andby further bathingoccurring in the chamber 12 and'passa-ge 14;

The oil. feed. is effected byy the Siphon produced by the flow of air through the nozzle and by the 'pressure' of air againstthe oil precipitated in the chamber of ther capV 9.

The nozzle is extremely simple in its construction aud is-therefore not costly to manufactureand itV can be used in practically any type of furnace.

p Thedeinite circulation of a current of air from the passa-ge' in theburner is a very. important factor in preventingv the carbonizationof the @um uic burner and in furnishing a supply of not airy tothe nozzlelWhat I claim a'sf'nry invention is :-v

1: An oilb'u-rner nozzle having a passage therethrough, a baiile arranged intermediate of the length of saidpassage, an oil trap connected with said passage below said baffle, a converging discharge nozzle arranged at the end of said passage, an oil tube having a discharge end arranged in said convergent passage and having its other end extending into the oil trap to a' level below that of the discharge' end.

2. VAn oil burner nozzle having a longitudinal passage therein, a baiile extending across said passage, a'n' oil` trap connected with said passage below said baflie, an air passage leading from the top of the oil trap, a convergent nozzle connectedwith said air passage and directing a. flow of air downwardly, an oil tube extending upwardly througlr said air passage from saidoil trap, and an oildischarge tube connectedwith the latter tube' and'di'recting oil through ther discharge opening' of' said air nozzle above the lower end of the oil tube.

3. An oil burner'nozzle, comprising a met-al casting having a longitudinal passage through the centre thereof having a downwardly directed discharge opening, aholl'ow cap extending downwardlyV from Vsaid discharge opening and forming an oil trap,an

airv chamber extending upwardly in' said casting from said oil trap, an air discharge nozzle leading downwardly from saidair chamber, and an oil feed pipe leading upwardlyfronr said trap and having-'a discharge into said air discharge nozzle'.

4*; An oil burner nozzle, comprising a metal casting having a longitudinal passage through the centre thereof having a down-y wardly directed discharge opening, a'threaded boss surrounding said opening, a, hollow cap threaded into said openingand forming an oil trap, an' air chamber formedifn said casting above said boss and having ai down#y wardly directed discharge leading from its upper end, a threaded boss surroundingL the discharge end ofsaid airy chamber, a convergent nozzle threaded in said threaded boss` and an oil feed'tube leadingupwardly from the oil* trap in said cap and discharging'fdwnwardly through said threaded nozzle'. Y

5'. vAn oil burner nozzle, comprising a metal casting having a longitudinal central passirged openingthrough one end',- and a'pairzof sides-115 passages connected at' the outer end ofv the casting: and having vopening leading therefrom adj acent to' the' end opening'oftlie'central passage, means for drawing air through` said side passages and Vdischar ingthe samefillZO into the central passage, an olraparrangcd "at the outward end of the central passage and passage therethrough for conducting oil andti air in intermingled relation, means in said passage for arresting the liquid oil content m its passage, an oil dlscharge connected With said arresting means, an air discharge, and Y means for effecting a circulation of air around said central passage to maintain said passage at a temperature below the flashing temperature of oil.

7. An oil burner nozzle adapted to extend into the combustion chamber of a furnace and having a passage therethrough extending from the inlet to the discharge end thereof and conducting a mixture of oil and compressed air, an oil trap arranged in said passage in the path of flow of said oil and air mixture for arresting the liquid oil content of the mixture before it reaches the discharge end of said nozzle, an oil feed extending from said trap and conducting the arrested liquid oil therefrom to the discharge end of the nozzle, and an atomizing nozzle arranged at the discharge end of said nozzle passage and being connected With the interior of said passage.

ARTHUR P. HOLDEN. 

